Conversion of sulphur to `SO_(3)` has `Delta H = -2x Kcal` and conversion of `SO_(2)` to `SO_(3)` involves `DeltaH = -ykcal`. The correct thermochemical equation for formation of `SO_(2)` is

Options

A. `S+O_(2) rarr SO_(2) Delta H = (y-2x)`
B. `S+O_(2) rarr SO_(2) Delta H = -(y-2x)`
C. `S+O_(2) rarr SO_(2) Delta H = (x+y)`
D. `S+O_(2) rarr SO_(2) Delta H = 2y-3x`

Answer

A

Explanation

`S_((s)) + (3)/(2)O_(2(g)) rarr SO_(3(g)), -2x`
`SO_(2(g))+(1)/(2)O_(2(g)) rarr SO_(3(g)), -y`